Titlebar

Export bibliographic data
Literature by the same author
plus on the publication server
plus at Google Scholar

 

Understanding the Influence of Lattice Composition on the Photocatalytic Activity of Defect-Pyrochlore-Structured Semiconductor Mixed Oxides

Title data

Schwertmann, Larissa ; Gruenert, Anna ; Pougin, Anna ; Sun, Chenghua ; Wark, Michael ; Marschall, Roland:
Understanding the Influence of Lattice Composition on the Photocatalytic Activity of Defect-Pyrochlore-Structured Semiconductor Mixed Oxides.
In: Advanced Functional Materials. Vol. 25 (2014) Issue 6 . - pp. 905-912.
ISSN 1616-3028
DOI: https://doi.org/10.1002/adfm.201403092

Abstract in another language

The defect-pyrochlore-structured photocatalyst CsTaWO6 is an ideal starting material for anion doping from the gas phase, and is known to be highly active for solar hydrogen generation under simulated sunlight without co-catalysts. To investigate the active site of CsTaWO6 for hydrogen generation and to understand the effects of the two d0 elements in the compound, systematic and successive element substitution of tantalum and tungsten on the crystallographic 16c sites of the starting material has been performed. Substituting lattice tantalum with niobium hardly changes the band gap of the resulting compounds CsTa(1 −x)Nb x WO6, but the photocatalytic activity for hydrogen generation and oxidation reactions is strongly influenced. By investigating the surface reactivity toward adsorption, surface effects altering the activity are identified. In contrast, substituting lattice tungsten with molybdenum reduces the band gap of CsTaWO6 into the visible-light range. Materials containing Mo are however not able to generate hydrogen anymore, due to the altered conduction band positions proven by density functional theory calculations. CsTaMoO6 exhibits a band gap of 2.9 eV and evolves oxygen efficiently under UV light irradiation after CoPi co-catalyst deposition, and even under visible light small amounts of oxygen.

Further data

Item Type: Article in a journal
Refereed: Yes
Keywords: band gap engineering
Institutions of the University: Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Chemistry
Faculties
Faculties > Faculty of Biology, Chemistry and Earth Sciences
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Chemistry > Lehrstuhl Physikalische Chemie III > Lehrstuhl Physikalische Chemie III - Univ.-Prof. Dr. Roland Marschall
Result of work at the UBT: No
DDC Subjects: 500 Science > 540 Chemistry
Date Deposited: 04 Sep 2018 10:48
Last Modified: 30 Oct 2018 07:40
URI: https://eref.uni-bayreuth.de/id/eprint/45704